In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

Passage: Population densities of mistletoebirds recorded around Australia vary from 0 to 2 birds per hectare with a mean of 0.35 birds per hectare (in areas unaffected by agriculture), where the largest concentration was found in the Kakadu National Park, Northern Territory. The longevity of a mistletoebird has been recorded in southern Queensland where a banded adult male was recaptured near the banding site after 9 years. Mistletoebirds vocally mimic other birds. Heard in all seasons and given by both sexes, they have been recorded mimicking the mulga parrot ( Psephotus varius) as well as more than 25 different species of passerines. Predators known to have taken mistletoebird nestlings are the grey shrike-thrush (Colluricincla harmonica), pied butcherbird (Cracticus nigrogularis), pied currawong (Strepera graculina) and the Australian raven (Corvus coronoides). Nests have also been parasitized by a number of cuckoo species including the horsfield bronze cuckoo (Chrysococcyx basalis) and the fan-tailed cuckoo (Cuculus pyrrhophanus).
 Link Information:  It covers an area of 19804 km2, extending nearly 200 kilometres from north to south and over 100 kilometres from east to west.  Question: What is the size of the park where the largest concentration of Mistletoebirds can be found?
Answer: 19804 km2

Passage: Nakano reached the fourth round of the men's singles at the 1938 French Championships, a feat that would not be achieved again by a Japanese man until 2013. In July he was eliminated in the semifinals of the Queen's Club Championships by eventual winner Don Budge. In the fourth round he lost in three straight sets to Frantisek Cejnar from Czechoslovakia. In September of the same year he also reached the fourth round of the U.S National Championships in which he was defeated in four sets by Bobby Riggs. Together with his countryman Jiro Yamagishi he reached the quarterfinal of the men's doubles at the 1937 Wimbledon Championships. The two won the Maidstone Club's invitational tournament later the same month. They also clinched the doubles title of the Pacific Coast Men's Doubles Championship at the La Jolla Beach and Tennis Club. In August he reached the quarterfinal of the Newport Casino Invitational falling to Frank Parker. As a result, he became the third ranked player of Japan that year.
 Link Information: Don Budge defeated Roderich Menzel Question: Which player won the championship that Nakano reached the fourth round in in 1938?
Answer: Don Budge

Passage: In 1963-1964 Walker was a resident artist at the Oldenburgisches Staatstheater. He then became a resident artist at the Cologne Opera from 1964-1966. Other contracts soon followed with such companies as the Cincinnati Opera, the Houston Grand Opera, the Lyric Opera of Kansas City, the Miami Opera, and the New Orleans Opera among others. In 1971 he created the role of Jonathan Gilourin in the world premiere of Dominick Argento’s Colonel Jonathan the Saint at the Denver Lyric Opera. In 1974 he was handpicked by Sir Georg Solti to sing the role of the Evangelist in Bach's St Matthew Passion with the Chicago Symphony Orchestra (CSO). He returned twice more for performances with Solti and the CSO for performances of the Shepherd in Stravinsky's Oedipus Rex (1976) and Beethoven's Missa Solemnis (1977); the latter of which was recorded for London Records.
 Link Information: The theatre was first opened in the times of the Grand Duchy of Oldenburg, on 1 February 1833. Question: When was the venue created that Walker was a resident artist of?

Answer: 1833

